I don't think many people keep track of their exhaust back pressure on a regular basis, but it would be a good metric to have if you're experiencing performance issues. If you're rebuilding your hot section I assume you're also replacing the exhaust hose back to the water lift muffler (and beyond?), so in your case you'd be sure that your hoses haven't collapsed.
Depending on the price of the kit it might be worthwhile to take a measurement right after your project is done, and then maybe once a year afterward just to have a record. If you keep the boat for many years that record would be handy if you start noticing an increase in the back pressure, but I can't imagine its usefulness in the very short term.
S/V Free Spirit
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